Correlation of supercritical CO 2-ionic liquid vapor-liquid equilibria with the ε *-modified Sanchez-Lacombe equation of state

Masayuki Iguchi, Hiroshi MacHida, Yoshiyuki Sato, Richard L. Smith

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)


The ε*-modified Sanchez-Lacombe equation of state (ε*-modified SL EOS) contains a temperature-dependent interaction energy that allows it to provide better pure component ionic liquid pressure-volume-temperature representation than the original SL EOS. In this work, we applied the Îμ-modified SL EOS to correlate available high pressure CO 2-ionic liquid vapor-liquid equilibrium (VLE) data, which are important for developing viscosity correlations. Usual SL EOS mixing rules were applied with one interaction parameter, k ij, which was fitted to the data. For the case of k ij equal to zero, the Îμ-modified SL EOS could greatly improve the average relative deviation (ARD) of the VLE (ARD 14.6%) over that of the original SL EOS (ARD 44.0%). For the case of k ij being fitted for both EOS, representation of the VLE of both equations was similar (ARD≤9%). The ε*-modified SL EOS is able to describe the vapor-liquid equilibria data over a wide range of pressures (0.1<<100MPa) and gives semi-quantitative (ARD<15%) representation of CO 2 solubilities in many ionic liquids from knowledge of only the pure component properties.

Original languageEnglish
Pages (from-to)S95-S100
JournalAsia-Pacific Journal of Chemical Engineering
Issue numberSUPPL. 1
Publication statusPublished - 2012 May


  • ionic liquids
  • separations
  • solubility
  • supercritical fluids
  • thermodynamics

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Renewable Energy, Sustainability and the Environment
  • Waste Management and Disposal

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